I am encountering performance issues while playing Prey

To improve the games performance on your system start the game as far as the main menu, select Options and then Video from the tabs at the top of your screen.

From under Video settings select the option for Low Quality textures and lower your video resolution to 800x600. Now select the Advanced 1 tab from the left hand side and change the options as follows:

Use Shader programs - No

Enable Shadows - No

Enable Specular - No

Enable Bump maps - No

Vertical sync - No

Antialiasing - Off

High quality specular - No

Sharpen bumpmaps - No

Now select the Advanced 2 tab:

Use glow - No

High particle detail - No

High quality skinning - No

Image anisotropy - Off

Once you have selected the relevant video options ensure you click Apply changes before leaving this screen.